A Metropolitan Police spokesman in London told AAP that police had not yet released the names of the dead or injured and he could not help with a specific inquiry about Ms Zelenak.

"We are trying to locate people as best we can."

Sara is one of four Aussies caught up in the terror attack, fellow Brisbane woman Candice Hedge had her throat slit by a terrorists who stormed a pub in Borough Market, while Darwin man Andrew Morrison was stabbed in the neck on the street, walking up to the attacker thinking a fight had broken out.

DFAT are still working to confirm the identity of a mysterious fourth Aussie, believed to be missing.